JP2007044762A

JP2007044762A - Dry type safety device for combustible gas flow passage

Info

Publication number: JP2007044762A
Application number: JP2005255703A
Authority: JP
Inventors: Mitsuo Kiyohara; 光男清原
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-08-09
Filing date: 2005-08-09
Publication date: 2007-02-22

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dry type safety device for a combustible gas flow passage by which reverse flow in the passage is prevented and the warning is made when combustible gas is used with a pressure more than the flashback flame extinction capacity. <P>SOLUTION: The dry type safety device is provided with: a means having a check valve 41 and a shut-off valve 42 at a first flow passage 2a formed at a first way of a three-way cylindrical body 1 to prevent reverse flow, also to shut off normal flow, and to restrict the shut-off condition while enabling it to be released, a means having a extinction filter 51 and a receiver 53 in a second flow passage 3a formed at a second way of the three-way cylindrical body to gasify the flashback flame while permitting gases to flow, and a means having a shut-off valve rod 61 guided to the receiver and a third way of the three-way cylindrical body, and having a molten metal 63 put in so as to face the second flow passage, to shut off the normal flow, when the molten metal is melted by the heat of the flashback flame of the second flow passage, by the shut-off valve rod, while enabling it to be recognized. The shut-off condition brought out by the heat of the flashback flame and the dangerous pressure condition of the combustible gas are warned more positively with a marker. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明はガス溶接・切断・加熱又はこれに類する作業に用いられる可燃性ガス流路の乾式安全器に関する。 The present invention relates to a dry safety device for a flammable gas flow path used for gas welding, cutting, heating or similar operations.

従来の可燃性ガス流路の乾式安全器は、ガスの逆流を逆止弁によって防止し、流路内に発生した逆流圧を伴う逆火炎は、消炎フィルターを通過させてガス化し、そのガス化された逆流圧によって逆止弁に連動して作動する遮断弁によって、正常流を遮断するものが知られている。さらに流路内に組み込まれた可溶性金属が、逆火炎によって溶解して作動する遮断弁によって正常流を遮断する手段を有しているものもある。 The conventional dry safety device for combustible gas flow path prevents the back flow of gas by a check valve, and the back flame with the back flow pressure generated in the flow path is gasified by passing it through an extinguishing filter. It is known that a normal flow is cut off by a shut-off valve that operates in conjunction with a check valve by the generated back flow pressure. In addition, there is also a type in which the soluble metal incorporated in the flow path has means for shutting off the normal flow by a shut-off valve that operates by being melted by the back flame.

ところが、従来の可燃性ガス流路の乾式安全器は、逆火炎に伴う逆流圧によって逆流を防止する逆止弁と連動して作動する遮断弁が正常流を遮断し、該遮断弁に連動して作動する遮断状態を復帰させるためのスリーブが、その位置によって外側から遮断状態を認知可能となっているが、流路内の可溶性金属が溶解して作動する遮断弁棒が正常流を遮断しても、その遮断状態を外側から認知できない。そのため流路内に火炎が発生し流路が閉じられていても、火炎が発生した危険な状態や、ガスが流れでないことの原因を特定するのに手間取ってしまう。また、消炎フィルターの逆火炎の阻止性能は、逆火発生前の可燃性ガスの圧力と、その可燃性ガスとの空気又は酸素の混合状態よって左右され、消炎フィルターの性能を越える圧力での可燃性ガスを、誤って使用して逆火炎が発生した場合は、その逆火炎を阻止できず、逆火炎はガスの供給元まで達することもあり非常に危険である。
特許第３０６０２０５特開２００１−３１４９６４ However, in the conventional dry type safety device of the combustible gas flow path, the shutoff valve that operates in conjunction with the check valve that prevents the backflow by the backflow pressure accompanying the backflame shuts off the normal flow and works in conjunction with the shutoff valve. The sleeve for returning the shut-off state that operates can be recognized from the outside depending on its position, but the shut-off valve rod that works by dissolving the soluble metal in the flow path shuts off the normal flow However, the blocking state cannot be recognized from the outside. Therefore, even if a flame is generated in the flow path and the flow path is closed, it takes time to identify the dangerous state in which the flame has occurred and the cause of the gas not flowing. In addition, the flame retarding performance of the flame extinguishing filter depends on the pressure of the combustible gas before the occurrence of the backfire and the mixed state of air or oxygen with the combustible gas. If a back flame is generated by misuse of sex gas, the back flame cannot be prevented, and the back flame may reach the gas supply source, which is very dangerous.
Patent No. 3060205 JP 2001-314964 A

本発明は、上記従来の問題点を解消するため、逆火炎に伴う逆流圧によって逆止弁が作動して、該逆止弁に連動する遮断弁によって正常流を遮断し、その遮断状態を解除可能に拘束して、遮断状態を認知できるとともに、逆火炎に伴う逆流圧がほとんど発生しないような状態においても逆火炎の熱によっても流路を遮断し、さらにその遮断状態を外部から容易に認知可能とし、その遮断状態をより積極的にマーカーによって知らせる。
また消炎フィルターの性能を越える可燃性ガスの圧力で使用した場合に、マーカーによって警告することをも可能として、安全で利便性に富み、より信頼性の高い可燃性ガス流路の乾式安全器を提供することを目的とする。In order to eliminate the above-mentioned conventional problems, the present invention operates the check valve by the backflow pressure accompanying the back flame, shuts off the normal flow by the shutoff valve linked to the check valve, and releases the shutoff state. It can be constrained to recognize the interrupted state, and the flow path is interrupted by the heat of the back flame even in a state where the backflow pressure accompanying the back flame hardly occurs, and the interrupted state is easily recognized from the outside. It is possible to inform the state of blockage more actively by a marker.
In addition, when using at a flammable gas pressure that exceeds the performance of the flame filter, it is possible to warn with a marker, and a safer, more convenient and more reliable dry safety device with a flammable gas flow path. The purpose is to provide.

本発明は上記目的を達成するために、端部に第２開口部（１ｂ）と他端部に第３開口部（１ｃ）を有する円筒部（１１）と、該円筒部（１１）に交差して延びるその端部に、第１開口部（１ａ）を有する分岐筒部（１２）と、が内部に連続した空間を有して形成された三方筒体（１）を具備し、上記分岐筒部（１２）の第１開口部（１ａ）に第１筒体（２）が連結されて形成される第１流路（２ａ）に、逆流を防止する逆止弁（４１）と、該逆止弁（４１）に連動して流路を遮断する遮断弁（４２）を具備して、逆流を防止するとともに流路を遮断し、その遮断状態を解除可能に拘束する手段と、上記円筒部（１１）の第２開口部（１ｂ）に第２筒体（３）が連結されて形成される筒部（５２）を有して、上記第１流路（２ａ）に連通する第２流路（３ａ）が形成され、該第２流路（３ａ）にガスは通過するが逆火炎をガス化する円筒状の消炎フィルター（５１）と、片側が上記消炎フィルター（５１）を内側から支持可能に、他方の片側が上記筒部（５２）に組み込まれて流路（５３ａ）を形成可能なフランジ部（５３ｂ）を有する円筒状の受座（５３）と、を具備して逆火炎をガス化する手段と、上記円筒部（１１）の第３開口部（１ｃ）側の端部に取り付けられた遮断弁棒キャップ（６２）と、中間に位置して第１”ｏ”リング（６１ａ）が取り付けられ、片側が上記遮断弁棒キャップ（６２）に往復動可能な外周面に連続して、第２”ｏ”リング（６１ｂ）が取り付けられて上記第３開口部（１ｃ）の内周面に気密状に往復動可能な外周面を有し、他方の片側が第３”ｏ”リング（６１ｃ）が取り付けられて上記受座（５３）の内周面に気密状に往復動可能な丸棒状の遮断弁棒（６１）と、上記遮断弁棒キャップ（６２）に片係して常に上記遮断弁棒（６１）を二次側に付勢するスプリング（６１ｄ）と、上記第２流路（３ａ）に臨むように組み込まれる手段を有して常温では固体状であって、熱せられると溶解する溶解金属（６３）と、を具備して逆火炎の熱によって上記溶解金属（６３）が溶解した際に流路を遮断し、その遮断状態を認知可能な手段と、が設けられ、
正常流のガスは上記第１流路（２ａ）の一次側から上記第２流路（３ａ）の二次側へと流れ、
上記消炎フィルター（５１）は、その片側端面が上記受座（５３）のフランジ部（５３ｂ）の端面に第１パッキン（５４ａ）を介し、他方の端面が上記円筒部（１１）の第２開口部（１ｂ）の底端面に取り付けられた第２パッキン（５４ｂ）を介して上記筒部（５２）に組み込まれ、
上記遮断弁棒（６１）は、上記スプリング（６１ｄ）によって常に二次側へ付勢されている該遮断弁棒（６１）の二次側の端部が、上記第２流路（３ａ）に組み込まれた固体状の上記溶解金属（６３）に突き当たった位置で、上記遮断弁棒（６１）に取り付けられた上記第１”ｏ”リング（６１ａ）の外側の空間に、上記第１流路（２ａ）から連通して上記消炎フィルター（５１）の内部に通じる手段を有するその流路に連通する流路（５２ａ）が形成され、
上記第２流路（３ａ）の正常流のガスは、上記第１流路（２ａ）から上記流路（５２ａ）を通過して、上記消炎フィルター（５１）の内部に入り、該消炎フィルター（５１）の内部から該消炎フィルター（５１）の筒壁を通過し、上記第２パッキン（５４ｂ）、上記消炎フィルター（５１）、上記第１パッキン（５４ａ）ならび上記受座（５３）のフランジ部（５３ｂ）のそれぞれの外周面と、上記筒部（５２）の外周面と、の環状の空間から、上記フランジ部（５３ｂ）が上記筒部（５２）に組み込まれて形成された上記流路（５３ａ）を通って、上記第２流路（３ａ）の二次側へと流れ、
上記第２流路（３ａ）を逆流する逆火炎は、上記消炎フィルター（５１）の外周面からその筒壁を通過する際にガス化され、さらに上記溶解金属（６３）が、逆火炎に触れて溶解した際、上記遮断弁棒（６１）は、上記遮断弁棒キャップ（６２）に片係している上記スプリング（６１ｄ）に押されて二次側方向に移動し、上記遮断弁棒（６１）に取り付けられた上記第１”ｏ”リング（６１ａ）によって、上記流路（５２ａ）を閉じて上記第２流路（３ａ）を遮断し、
上記第２流路（３ａ）の遮断状態を認知可能な手段は、上記遮断弁棒（６１）が上記流路（５２ａ）を開いている正常状態の位置において、上記遮断弁棒キャップ（６２）に案内される側の上記遮断弁棒（６１）の先端部は、上記遮断弁棒キャップ（６２）の外側端面より埋没しない形状を有していて、上記遮断弁棒（６１）が上記流路（５２ａ）を閉じて遮断状態のとき、上記遮断弁棒キャップ（６２）の外側端面からの上記遮断弁棒（６１）の端部の位置が、正常状態に位置するときとの違いによって、遮断状態を認知可能なことを特徴として有している。In order to achieve the above object, the present invention intersects the cylindrical portion (11) having a second opening (1b) at the end and a third opening (1c) at the other end, and the cylindrical portion (11). A branch cylinder (12) having a first opening (1a) at its end, and a three-way cylinder (1) formed with a continuous space inside, the branch A check valve (41) for preventing backflow in the first flow path (2a) formed by connecting the first cylinder (2) to the first opening (1a) of the cylinder (12); A cylinder having a shut-off valve (42) for shutting off the flow path in conjunction with the check valve (41), preventing the back flow, shutting off the flow path and restraining the shut-off state so as to be releasable; The second opening (1b) of the portion (11) has a cylindrical portion (52) formed by connecting the second cylindrical body (3), and communicates with the first flow path (2a). A flow path (3a) is formed, and a gas is passed through the second flow path (3a), but a cylindrical flame extinguishing filter (51) that gasifies the reverse flame, and one side of the flame extinguishing filter (51) from the inside. A cylindrical receiving seat (53) having a flange portion (53b) which can be supported and has the flange portion (53b) formed on the other side of the cylindrical portion (52) to form a flow path (53a). Gasifying means, a shut-off valve rod cap (62) attached to the end of the cylindrical portion (11) on the third opening (1c) side, and a first “o” ring ( 61a) is attached, and one side is continuous with the outer peripheral surface capable of reciprocating to the shut-off valve stem cap (62), and a second “o” ring (61b) is attached to the third opening (1c). Has an outer peripheral surface that can reciprocate in an airtight manner on the inner peripheral surface, and the other side is the third “o” (61c) is attached to the inner peripheral surface of the seat (53) so as to reciprocate in a gas-tight manner, and is connected to the shut-off valve stem cap (62). It has a spring (61d) that always biases the shut-off valve rod (61) to the secondary side, and means that is incorporated so as to face the second flow path (3a). A melting metal (63) that melts when heated, and a means for blocking the flow path when the melting metal (63) is melted by the heat of the back flame and recognizing the blocking state. ,
The normal flow gas flows from the primary side of the first flow path (2a) to the secondary side of the second flow path (3a),
The flame extinguishing filter (51) has one end face on the end face of the flange (53b) of the seat (53) via the first packing (54a) and the other end face on the second opening of the cylindrical portion (11). Incorporated into the cylindrical part (52) via the second packing (54b) attached to the bottom end surface of the part (1b),
The secondary valve end of the cutoff valve rod (61), which is constantly biased to the secondary side by the spring (61d), is connected to the second flow path (3a). The first flow path is formed in a space outside the first “o” ring (61a) attached to the shut-off valve rod (61) at a position where it hits the incorporated solid molten metal (63). A channel (52a) communicating with the channel having means for communicating with (2a) and communicating with the inside of the anti-flame filter (51) is formed;
The normal flow gas in the second flow path (3a) passes through the flow path (52a) from the first flow path (2a) and enters the inside of the flame filter (51). 51) passes through the cylindrical wall of the flame-extinguishing filter (51), and the flange portion of the second packing (54b), the flame-extinguishing filter (51), the first packing (54a) and the seat (53). The flow path formed by incorporating the flange portion (53b) into the cylindrical portion (52) from the annular space between the respective outer peripheral surfaces of (53b) and the outer peripheral surface of the cylindrical portion (52). (53a) to the secondary side of the second flow path (3a),
The back flame that flows back through the second flow path (3a) is gasified when passing through the cylindrical wall from the outer peripheral surface of the extinguishing filter (51), and the molten metal (63) touches the back flame. When dissolved, the shut-off valve stem (61) is pushed by the spring (61d) that is unilaterally engaged with the shut-off valve stem cap (62) and moves in the secondary direction, and the shut-off valve stem ( 61) The first “o” ring (61a) attached to 61) closes the flow path (52a) and shuts off the second flow path (3a),
The means capable of recognizing the shut-off state of the second flow path (3a) is such that the shut-off valve rod (61) is in a normal state where the flow path (52a) is open, and the shut-off valve stick cap (62). The front end portion of the shut-off valve rod (61) on the side guided by the valve has a shape that is not buried from the outer end surface of the shut-off valve rod cap (62), and the shut-off valve rod (61) is in the flow path. When the shut-off state is closed with (52a) closed, the position of the end of the shut-off valve stem (61) from the outer end face of the shut-off valve stem cap (62) differs depending on the difference from the normal position. It is characterized by being able to recognize the state.

前記三方筒体（１）は、端部に第２開口部（１ｂ）と他端部に第３開口部（１ｃ）を有する円筒部（１１）と、該円筒部（１１）に直角方向に交差して延びるその端部に、第１開口部（１ａ）を有する分岐筒部（１２）と、が内部に連続した空間を有していることを特徴として有している。 The three-way cylinder (1) includes a cylindrical portion (11) having a second opening (1b) at the end and a third opening (1c) at the other end, and a direction perpendicular to the cylindrical portion (11). The branch cylinder part (12) which has a 1st opening part (1a) has the space which continued in the inside at the end part which cross | intersects, and it has as a characteristic.

前記遮断弁棒キャップ（６２）は、前記遮断弁棒（６１）の先端部を案内可能に内周面にマーカー（６１ｅ）が取り付けられていて、上記遮断弁棒（６１）が前記流路（５２ａ）を開いているとき、該遮断弁棒（６１）の先端部は、上記遮断弁棒キャップ（６２）の端面より埋没せず、上記マーカー（６１ｅ）を隠し、上記遮断弁棒（６１）が上記流路（５２ａ）を閉じたとき、上記マーカー（６１ｅ）が露出することを特徴として有している。 The shut-off valve stem cap (62) has a marker (61e) attached to the inner peripheral surface so that the tip of the shut-off valve stem (61) can be guided, and the shut-off valve stem (61) is connected to the flow path (61). 52a) is open, the tip of the shut-off valve stem (61) is not buried from the end face of the shut-off valve stem cap (62), conceals the marker (61e), and the shut-off valve stem (61) However, when the flow path (52a) is closed, the marker (61e) is exposed.

前記遮断弁棒（６１）は、前記遮断弁棒キャップ（６２）に案内される端部の外周面に、正常状態において該遮断弁棒キャップ（６２）から露出しない位置にマーカー（６１ｆ）が取り付けられていて、正常流のガスの圧力が上記遮断弁棒（６１）を常に二次側に付勢しているスプリング（６１ｄ）の押力よりもが高くなった際、その内圧によって上記遮断弁棒（６１）の先端部が上記遮断弁棒キャップ（６２）の外側に押し出され、上記マーカー（６１ｆ）が露出することを特徴として有している。 A marker (61f) is attached to the outer peripheral surface of the end portion guided by the shut-off valve stem cap (62) at a position where the shut-off valve stem (61) is not exposed from the shut-off valve stem cap (62) in a normal state. When the pressure of the normal flow gas becomes higher than the pressing force of the spring (61d) always urging the shut-off valve rod (61) to the secondary side, the internal pressure causes the shut-off valve The tip of the rod (61) is pushed out of the shut-off valve rod cap (62), and the marker (61f) is exposed.

前記受座（５３）は、外周面が一次側端部から、前記消炎フィルター（５１）の内周面を案内可能な外周部と、上記消炎フィルター（５１）に組み込まれて該消炎フィルター（５１）の内周面と環状の空間を形成可能な外周部と、上記消炎フィルター（５１）の内周面を案内可能な外周部と、上記消炎フィルター（５１）を片係可能に該消炎フィルター（５１）の外径と同じ外径を有するフランジ部（５３ｂ）と、が一連に形成され、さらに該フランジ部（５３ｂ）に連接して、そのフランジ部（５３ｂ）とともに前記筒部（５２）に組み込まれて前記流路（５３ａ）を形成する軸部（５３ｃ）を有し、
上記受座（５３）の内周面は、前記遮断弁棒（６１）を案内可能に一次側端面が、該遮断弁棒（６１）に填め込まれた第１”ｏ”リング（６１ａ）と接合可能な大径部と、該遮断弁棒（６１）に取りつけられた前記第３”ｏ”リング（６１ｃ）が気密状に往復動可能な小径部と、が連続して形成され、上記受座（５３）の内周大径部分に位置して、上記消炎フィルター（５１）の内周面と環状の空間を形成可能な外周面の筒壁に、上記受座（５３）の内側から上記消炎フィルター（５１）の内側に通ずる通し穴（５３ｄ）が設けられていることを特徴として有している。The seat (53) has an outer peripheral surface that can guide the inner peripheral surface of the flame-extinguishing filter (51) from the primary side end, and the flame-extinguishing filter (51). ) And an outer peripheral portion capable of forming an annular space, an outer peripheral portion capable of guiding the inner peripheral surface of the flame-extinguishing filter (51), and the flame-extinguishing filter (51) capable of being engaged with each other. 51) and a flange portion (53b) having the same outer diameter as that of the outer diameter of 51) are formed in series, and further connected to the flange portion (53b), together with the flange portion (53b), to the cylindrical portion (52). A shaft portion (53c) that is incorporated to form the flow path (53a);
The inner peripheral surface of the seat (53) has a first "o" ring (61a) whose primary side end face is fitted in the shut-off valve rod (61) so that the shut-off valve rod (61) can be guided. A large-diameter portion that can be joined and a small-diameter portion that allows the third “o” ring (61c) attached to the shut-off valve rod (61) to reciprocate in an airtight manner are formed continuously. The cylindrical wall of the outer peripheral surface, which is located at the inner peripheral large diameter portion of the seat (53) and can form an annular space with the inner peripheral surface of the flame-extinguishing filter (51), from the inside of the seat (53) A feature is that a through-hole (53d) communicating with the inside of the flame-extinguishing filter (51) is provided.

請求項１によれば、端部に第２開口部（１ｂ）と他端部に第３開口部（１ｃ）を有する円筒部（１１）と、該円筒部（１１）に交差して延びるその端部に、第１開口部（１ａ）を有する分岐筒部（１２）と、が内部に連続した空間を有して形成された三方筒体（１）を具備し、上記分岐筒部（１２）の第１開口部（１ａ）に第１筒体（２）が連結されて形成される第１流路（２ａ）に、逆止弁（４１）と遮断弁（４２）を具備して、逆流を阻止するとともに正常流を遮断し、その遮断状態を解除可能に拘束する手段と、上記円筒部（１１）の第２開口部（１ｂ）に第２筒体（３）が連結されて形成される筒部（５２）を有して上記第１流路（２ａ）に連通する第２流路（３ａ）が形成され、該第２流路（３ａ）にガスは通過するが逆火炎をガス化する円筒状の消炎フィルター（５１）と、片側が上記消炎フィルター（５１）を内側から支持可能に、他方の片側が上記筒部（５２）に組み込まれて流路（５３ａ）を形成可能なフランジ部（５３ｂ）を有する円筒状の受座（５３）と、を具備して逆火炎をガス化する手段と、上記円筒部（１１）の第３開口部（１ｃ）側の端部に取り付けられた遮断弁棒キャップ（６２）と、中間に位置して第１”ｏ”リング（６１ａ）が取り付けられ、片側が上記遮断弁棒キャップ（６２）に往復動可能な外周面に連続して、第２”ｏ”リング（６１ｂ）が取り付けられて上記第３開口部（１ｃ）の内周面に気密状に往復動可能な外周面を有し、他方の片側が第３”ｏ”リング（６１ｃ）が取り付けられて上記受座（５３）との内周面に気密状に往復動可能な丸棒状の遮断弁棒（６１）と、上記遮断弁棒キャップ（６２）に片係して常に上記遮断弁棒（６１）を二次側に付勢するスプリング（６１ｄ）と、上記第２流路（３ａ）に臨むように組み込まれ、常温では固体状であって、熱せられると溶解する溶解金属（６３）と、を具備して逆火炎の熱によって上記溶解金属（６３）が溶解した際に正常流を遮断し、その遮断状態を認知可能な手段と、が設けられ、
逆火炎の熱によって上記溶解金属（６３）が溶解した際に正常流を遮断する手段と、その遮断状態を認知可能な手段は、上記スプリング（６１ｄ）によって常に二次側へ付勢されている該遮断弁棒（６１）の端部が、上記第２流路（３ａ）に組み込まれた上記溶解金属（６３）に突き当たった位置で、上記遮断弁棒（６１）に取り付けられた上記第１”ｏ”リング（６１ａ）の外側の空間に、上記第１流路（２ａ）から連通して上記消炎フィルター（５１）の内側に通じる手段を有するその流路に連通する流路（５２ａ）が形成され、逆火炎の熱によって上記溶解金属（６３）が溶解した際、遮断弁棒（６１）は、上記遮断弁棒キャップ（６２）に片係している上記スプリング（６１ｄ）に押されて二次側方向に移動し、上記遮断弁棒（６１）に取り付けられた上記第１”ｏ”リング（６１ａ）によって、上記流路（５２ａ）を閉じて上記第２流路（３ａ）を遮断し、上記遮断弁棒（６１）が上記流路（５２ａ）を開いている正常状態の位置において、上記遮断弁棒キャップ（６２）に案内される側の該遮断弁棒（６１）の先端部は、上記遮断弁棒キャップ（６２）の外側端面より埋没しない形状を有していて、上記遮断弁棒（６１）が上記流路（５２ａ）を閉じて遮断状態のとき、上記遮断弁棒キャップ（６２）の外側端面からの上記遮断弁棒（６１）の端部の位置が、正常状態に位置するときとの違いによって、逆火炎の発生による遮断状態を外見で認知でき、その危険な状況に直ちに対処できるため安全作業の上で役立ち便利である。According to claim 1, the cylindrical portion (11) having the second opening (1b) at the end and the third opening (1c) at the other end, and extending extending across the cylindrical portion (11) The branch cylinder part (12) which has a 1st opening part (1a) in an edge part, and the three-way cylinder (1) formed with the space which continued inside are comprised, The said branch cylinder part (12 ) Having a check valve (41) and a shut-off valve (42) in the first flow path (2a) formed by connecting the first cylinder (2) to the first opening (1a) of The second cylinder (3) is connected to the second opening (1b) of the cylindrical portion (11) and means for blocking the normal flow and blocking the normal flow so that the blocked state can be released. A second flow path (3a) having a cylindrical portion (52) that communicates with the first flow path (2a) is formed, and gas passes through the second flow path (3a) but a reverse flame is generated. Ga A cylindrical flame extinguishing filter (51) that can be turned into one side, the flame extinguishing filter (51) can be supported from the inside on one side, and the other side can be incorporated into the cylindrical part (52) to form a flow path (53a) A cylindrical seat (53) having a flange portion (53b) and means for gasifying the reverse flame, and an end of the cylindrical portion (11) on the third opening (1c) side The attached shut-off valve stem cap (62) and the first “o” ring (61a) are attached in the middle, and one side is continuous with the outer peripheral surface capable of reciprocating with the shut-off valve stem cap (62). The second “o” ring (61b) is attached to the inner peripheral surface of the third opening (1c) and has an outer peripheral surface that can reciprocate in an airtight manner, and the other one side is the third “o”. A ring (61c) is attached and reciprocates in an airtight manner on the inner peripheral surface with the seat (53). A possible round bar-shaped shut-off valve stem (61), a spring (61d) that always urges the shut-off valve stem (61) to the secondary side in a single engagement with the shut-off valve stem cap (62), and the first The molten metal (63) is incorporated by facing the two flow paths (3a) and is solid at room temperature and melts when heated, and the molten metal (63) is dissolved by the heat of the back flame. And a means for interrupting normal flow and recognizing the blocked state when provided,
The means for blocking the normal flow when the molten metal (63) is melted by the heat of the reverse flame and the means for recognizing the blocked state are always urged to the secondary side by the spring (61d). The first valve attached to the shut-off valve rod (61) at a position where an end of the shut-off valve rod (61) hits the molten metal (63) incorporated in the second flow path (3a). In the space outside the “o” ring (61a), there is a flow path (52a) communicating with the flow path having means communicating from the first flow path (2a) to the inside of the anti-flame filter (51). When the molten metal (63) is melted by the heat of the back flame, the shut-off valve stem (61) is pushed by the spring (61d) that is unilaterally engaged with the shut-off valve stem cap (62). Move in the secondary direction, the shut-off valve stem (61 The first “o” ring (61 a) attached to the channel closes the flow path (52 a) to block the second flow path (3 a), and the shut-off valve rod (61) is connected to the flow path (52 a ) Is opened, the tip of the shut-off valve stem (61) on the side guided by the shut-off valve stem cap (62) is buried from the outer end surface of the shut-off valve stem cap (62). When the shut-off valve rod (61) closes the flow path (52a) and is in a shut-off state, the shut-off valve rod (61) from the outer end surface of the shut-off valve rod cap (62) Depending on the difference between the position of the end of the frame and the position in the normal state, the interruption state due to the occurrence of the back flame can be recognized visually, and the dangerous situation can be dealt with immediately, which is useful and convenient for safety work.

請求項２によれば、前記三方筒体（１）は、端部に第２開口部（１ｂ）と他端部に第３開口部（１ｃ）を有する円筒部（１１）と、該円筒部（１１）に直角方向に交差して延びるその端部に、第１開口部（１ａ）を有する分岐筒部（１２）と、が内部に連続した空間を有して形成され、三方筒体（１）の形状を変更するだけで、他の構成部品を変えずにＬ字状の配管経路にも用いられることが可能となって請求項１に同じ効果を有する。 According to claim 2, the three-way cylinder (1) includes a cylindrical portion (11) having a second opening (1b) at the end and a third opening (1c) at the other end, and the cylindrical portion. A branch cylinder part (12) having a first opening (1a) at its end extending perpendicularly to (11) is formed with a continuous space inside, and a three-way cylinder ( By simply changing the shape of 1), it can be used for an L-shaped piping route without changing other components, and has the same effect as in claim 1.

請求項３によれば、前記遮断弁棒キャップ（６２）は、前記遮断弁棒（６１）の先端部を案内可能に内周面にマーカー（６１ｅ）が取り付けられていて、上記遮断弁棒（６１）が前記流路（５２ａ）を開いているとき、該遮断弁棒（６１）の先端部は、上記遮断弁棒キャップ（６２）の端面より埋没せず、上記マーカー（６１ｅ）を隠し、上記遮断弁棒（６１）が上記流路（５２ａ）を閉じたとき、上記マーカー（６１ｅ）が露出するよう形成されているため、マーカー（６１ｅ）によって遮断状態を認知でき便利である。 According to claim 3, the shut-off valve stem cap (62) is provided with a marker (61e) on the inner peripheral surface so as to guide the tip of the shut-off valve stem (61), and the shut-off valve stem ( 61) when the flow path (52a) is open, the tip of the shut-off valve stem (61) is not buried from the end face of the shut-off valve stem cap (62), concealing the marker (61e), Since the marker (61e) is formed to be exposed when the shutoff valve rod (61) closes the flow path (52a), it is convenient to recognize the shutoff state by the marker (61e).

請求項４によれば、前記遮断弁棒（６１）は、前記遮断弁棒キャップ（６２）に案内される端部の外周面に、正常状態において該遮断弁棒キャップ（６２）から露出しない位置にマーカー（６１ｆ）が取り付けられていて、正常流のガスの圧力が上記遮断弁棒（６１）を常に二次側に付勢しているスプリング（６１ｄ）の押力よりもが高くなった際、その内圧によって上記遮断弁棒（６１）の先端部が上記遮断弁棒キャップ（６２）の外側に押し出され、上記マーカー（６１ｆ）が露出するように相対的に形成されているため、上記スプリング（６１ｄ）の強さを、前記消炎フィルター（５１）の逆火炎阻止の最大能力に対応する圧力に設定することによって、逆火炎の阻止能力以上の圧力での可燃性ガスを使用した場合に、マーカー（６１ｆ）によって警告することが可能となり作業の安全性を図るために便利である。 According to claim 4, the shut-off valve stem (61) is not exposed on the outer peripheral surface of the end guided by the shut-off valve stem cap (62) in the normal state from the shut-off valve stem cap (62). When the marker (61f) is attached to the valve and the pressure of the normal flow gas is higher than the pressing force of the spring (61d) that constantly biases the shut-off valve rod (61) to the secondary side. Since the tip of the shut-off valve stem (61) is pushed out of the shut-off valve stem cap (62) by the internal pressure, the marker (61f) is relatively exposed so that the spring When the intensity of (61d) is set to a pressure corresponding to the maximum ability of the flame extinguishing filter (51) to prevent reverse flame, when a combustible gas at a pressure equal to or higher than the ability of preventing reverse flame is used, Marker (61 ) Is convenient in order to secure the can and will work to warn by.

請求項５によれば、前記受座（５３）は、円筒状に形成されてその外周面が一次側端部から、前記消炎フィルター（５１）の内側から支持する外周部と、上記消炎フィルター（５１）に組み込まれて該消炎フィルター（５１）の内周面と環状の空間を形成可能な外周面と、上記消炎フィルター（５１）の内側から支持する外周部と、上記消炎フィルター（５１）を片係可能に、該消炎フィルター（５１）の外径と同じ外径を有するフランジ部（５３ｂ）と、が一連に形成され、さらに該フランジ部（５３ｂ）に連接してそのフランジ部（５３ｂ）とともに前記筒部（５２）に組み込まれて前記流路（５３ａ）を形成する軸部（５３ｃ）を有し、
上記受座（５３）の内周面は、前記遮断弁棒（６１）を案内可能に一次側端面が、該遮断弁棒（６１）に填め込まれた”ｏ”リング（６２ａ）と接合可能な大径部と、該遮断弁棒（６１）に取りつけられた前記第２”ｏ”リング（６２ｃ）が気密状に往復動可能な小径部と、が連続して形成され、上記受座（５３）の内周大径部分に位置して、上記消炎フィルター（５１）の内周面と環状の空間を形成可能な外周面の筒壁に、上記受座（５３）の内側から上記消炎フィルター（５１）の内側に通ずる通し穴（５３ｄ）が設けられて形成されているため、上記”ｏ”リング（６２ａ）と第２”ｏ”リングが取り付けられた遮断弁棒（６１）と、受座（５３）ならび溶解金属（６３）との組立検査を、三方筒体（１）の円筒部（１１）に組み込む前にも行うことができるため信頼性の向上が図れる。According to claim 5, the seat (53) is formed in a cylindrical shape, and the outer peripheral surface thereof is supported from the primary side end portion from the inside of the flame extinguishing filter (51), and the flame extinguishing filter ( 51), an outer peripheral surface that can form an annular space with the inner peripheral surface of the flame-extinguishing filter (51), an outer peripheral portion that is supported from the inside of the flame-extinguishing filter (51), and the flame-extinguishing filter (51). A flange portion (53b) having the same outer diameter as that of the flame extinguishing filter (51) is formed in series so as to be able to be engaged with one another, and is further connected to the flange portion (53b) to be connected to the flange portion (53b). And a shaft portion (53c) that is incorporated in the cylindrical portion (52) to form the flow path (53a),
The inner peripheral surface of the seat (53) can be joined to the o-ring (62a) whose primary side end face is fitted in the shut-off valve rod (61) so that the shut-off valve rod (61) can be guided. A large-diameter portion and a small-diameter portion in which the second “o” ring (62c) attached to the shut-off valve rod (61) can reciprocate in an airtight manner are formed continuously. 53) on the inner peripheral large-diameter portion of the flame extinguishing filter (51) and on the cylindrical wall of the outer peripheral surface capable of forming an annular space, the flame extinguishing filter from the inside of the seat (53) Since the through hole (53d) communicating with the inside of (51) is provided, the shut-off valve rod (61) to which the “o” ring (62a) and the second “o” ring are attached, Assembly inspection with seat (53) and molten metal (63) is incorporated into the cylindrical part (11) of the three-way cylinder (1) Thereby improving the reliability since it is also possible to carry out the.

なお、特許請求範囲にいう「一次側」とは、本発明の可燃性ガス流路の乾式安全器ならびそれを構成する個々の部材に対して可燃性ガスの供給源側をいい、「二次側」とは、本発明の可燃性ガス流路の乾式安全器ならびそれを構成する個々の部材に対して可燃性ガスの放出側をいう。 The “primary side” in the claims means the dry safety device of the combustible gas flow path of the present invention and the source side of the combustible gas with respect to the individual members constituting the dry safety device. The “side” means the dry safety device of the combustible gas flow path of the present invention and the discharge side of the combustible gas with respect to the individual members constituting the dry safety device.

以下、図面に示す実施するための最良の形態により、本発明を詳細に説明する。 Hereinafter, the present invention will be described in detail with reference to the best mode for carrying out the invention shown in the drawings.

本発明の可燃性ガス用乾式安全器は、図１に示すように、三方筒体（１）が、端部に第２開口部（１ｂ）と他端部に第３開口部（１ｃ）が形成された円筒部（１１）と、該円筒部（１１）に交差して延びる端部に第１開口部（１ａ）が形成された分岐筒部（１２）と、が内部に連続した空間を有して一体に形成されている。 As shown in FIG. 1, the combustible gas dry safety device of the present invention has a three-way cylinder (1), a second opening (1b) at the end, and a third opening (1c) at the other end. A space in which the formed cylindrical portion (11) and a branch cylinder portion (12) in which a first opening (1a) is formed at an end portion that intersects the cylindrical portion (11) are continuous inside. And integrally formed.

上記分岐筒部（１２）は、上記第１開口部（１ａ）の内周大径部分に、“ｏ”リング（２ｂ）を介して円筒状の第１筒体（２）が気密状にネジ填め合い連結されて第１流路（２ａ）が形成される。 The branched cylindrical portion (12) is screwed in an airtight manner with a cylindrical first cylindrical body (2) through an “o” ring (2b) at the inner peripheral large diameter portion of the first opening (1a). The first flow path (2a) is formed by fitting and connecting.

上記第１筒体（２）は、その端部に”ｃ”ピン（２２）を介して取り付けられた袋ナット（２１）によって、可燃性ガス供給側の配管接続機器（図示略）に連結され、可燃性ガス供給源からの流路は、上記第１流路（２ａ）に連通する。 The first cylinder (2) is connected to a combustible gas supply side pipe connection device (not shown) by a cap nut (21) attached to the end of the first cylinder (2) via a "c" pin (22). The flow path from the combustible gas supply source communicates with the first flow path (2a).

上記円筒部（１１）は、上記第２開口部（１ｂ）の内周大径部分に、”ｏ”リング（３ｂ）を介して円筒状の第２筒体（３）が気密状にネジ填め合い連結され、上記第１流路（２ａ）に連通する第２流路（３ａ）が形成される。 The cylindrical part (11) is screwed in a gastight manner with a cylindrical second cylindrical body (3) through an “o” ring (3b) on the inner peripheral large diameter part of the second opening (1b). A second flow path (3a) is formed which is connected to each other and communicates with the first flow path (2a).

上記第２筒体（３）は、端部に形成された外ネジを有する配管接続部（３ｃ）がガス放出側の接続機器（図示略）に連結され、上記第２流路（３ａ）は該ガス放出側の接続機器へ連通する。 In the second cylinder (3), a pipe connection part (3c) having an external thread formed at an end is connected to a connection device (not shown) on the gas discharge side, and the second flow path (3a) It communicates with the connecting device on the gas discharge side.

上記第１流路（２ａ）に設けられて、逆流を防止するとともに正常流を遮断し、その遮断状態を解除可能に拘束する手段の詳細ついて、図３にないし図４に示して説明する。
逆圧を受けて正常流を解除可能に遮断する手段は各種あるが、本発明においては比較的に低圧力の逆圧を受けても解除可能に正常流を遮断する手段を選択している。The details of the means provided in the first flow path (2a) for preventing the back flow and blocking the normal flow and releasably restraining the blocked state will be described with reference to FIGS.
There are various means for blocking the normal flow so that the normal flow can be released by receiving the reverse pressure. In the present invention, the means for blocking the normal flow so that the normal flow can be released even when receiving a relatively low back pressure is selected.

逆流を阻止するとともに正常流を遮断する手段は、上記第１筒体（２）に組み込まれ、スプリング（４２ｅ）によって常に二次側に付勢されている遮断弁（４２）と、該遮断弁（４２）に組み込まれて、スプリング（４１ｃ）によって常に一次側に付勢されている逆止弁（４１）と、を具備して構成されている。 The means for blocking the reverse flow and blocking the normal flow includes a shut-off valve (42) incorporated in the first cylinder (2) and always biased to the secondary side by the spring (42e), and the shut-off valve (42) and a check valve (41) that is always biased to the primary side by a spring (41c).

上記第１筒体（２）は、円筒状に形成されているその内周面が、上記第１流路（２ａ）の入口となる小径部、後述の遮断弁（４２）に取り付けられた”ｏ”リング（４２ｂ）が気密状に接合可能な中径部、そして後述のロックピン案内溝（４５）を有する大径部が連続して形成されている。 The inner surface of the first cylinder (2) formed in a cylindrical shape is attached to a small-diameter portion serving as an inlet of the first flow path (2a), a shut-off valve (42) described later. The middle diameter portion to which the o ″ ring (42b) can be joined in an airtight manner and the large diameter portion having a lock pin guide groove (45) described later are continuously formed.

上記遮断弁（４２）は、その外周面が、小径部と、筒壁には複数の通気孔（４２ｆ）が設けられた中径部、そして大径部分とが連続し、その小径部の端部が封じられた円筒状に形成されて、上記第１筒体（２）の内周面に形成された小径部と中径部そして大径部に、それぞれ対応して案内され往復動可能に形成されている。
また、上記遮断弁（４２）の内周面は、後述の逆止弁（４１）が内部に組み込まれて、その逆止弁（４１）の外周部の小径部分、中径部分、そして大径部分のそれぞれ対して、案内し往復動可能に形成されている。The shut-off valve (42) has an outer peripheral surface continuous with a small-diameter portion, a medium-diameter portion provided with a plurality of vent holes (42f) in the cylindrical wall, and a large-diameter portion, and the end of the small-diameter portion. Are formed in a sealed cylindrical shape, and are guided correspondingly to the small-diameter portion, the medium-diameter portion and the large-diameter portion formed on the inner peripheral surface of the first cylindrical body (2), respectively, so as to be able to reciprocate. Is formed.
Further, a check valve (41), which will be described later, is incorporated in the inner peripheral surface of the shut-off valve (42), and a small-diameter portion, a medium-diameter portion, and a large-diameter portion of the outer peripheral portion of the check valve (41). Each part is guided and reciprocally movable.

上記遮断弁（４２）は、その外周面の小径部と中径部の段部に“ｏ”リング（４２ｂ）が取り付けられ、そして該遮断弁（４２）を常に二次側に付勢するためのスプリング（４２ｅ）が、上記第１筒体（２）の内周大径部と中径部の段部に片係して、上記遮断弁（４２）の外周大径部と中径部の段部と、の間に取り付けて上記第１筒体（２）の内部に組み込まれている。 The shut-off valve (42) is provided with an "o" ring (42b) at the steps of the small-diameter portion and the medium-diameter portion of the outer peripheral surface, and always biases the shut-off valve (42) to the secondary side. The spring (42e) of the first cylindrical body (2) is connected to the step portion of the inner peripheral large diameter portion and the intermediate diameter portion of the first cylinder (2), and the outer peripheral large diameter portion and the medium diameter portion of the shut-off valve (42). The first cylindrical body (2) is mounted between the stepped portion and the stepped portion.

また、上記遮断弁（４２）は、その外周大径部に上記第１筒体（２）に形成されている後述のロックピン案内溝（４５）を、上記第１筒体（２）の中心方向に両側から挟む位置となるよう形成された二つの環状の溝に、それぞれ第１”ｏ”リング（４２ｃ）と第２”ｏ”リング（４２ｄ）が填め込まれていて、上記遮断弁（４２）が上記第１筒体（２）の内部を往復動した際にも、上記第１筒体（２）の内部の気密性が保持される。 The shut-off valve (42) has a lock pin guide groove (45), which will be described later, formed in the first cylinder (2) at the outer peripheral large diameter portion, and a center of the first cylinder (2). The first “o” ring (42c) and the second “o” ring (42d) are fitted in two annular grooves formed so as to be sandwiched from both sides in the direction, respectively. Even when 42) reciprocates inside the first cylinder (2), the airtightness inside the first cylinder (2) is maintained.

上記遮断弁（４２）は、上記スプリング（４２ｅ）によって二次側に付勢されて、該遮断弁（４２）の二次側端部が、上記第１開口部（１ａ）の内周大径部の底端面に接合した状態において、上記第１筒体（２）の内周中径部と大径部の段部と、上記遮断弁（４２）に取り付けられた上記”ｏ”リング（４２ｂ）の外側と、の環状の空間に流路（４２ａ）が形成され、該流路（４２ａ）から上記通気孔（４２ｆ）を通って該遮断弁（４２）の内部に通ずる流路が形成される。 The shut-off valve (42) is biased to the secondary side by the spring (42e), and the secondary side end of the shut-off valve (42) has a large inner diameter of the first opening (1a). In the state of being joined to the bottom end face of the first portion (2), the inner circumferential inner diameter portion and the larger diameter step portion of the first cylinder (2), and the o ring (42b) attached to the shut-off valve (42) ) Is formed in an annular space, and a flow path is formed from the flow path (42a) through the vent hole (42f) to the inside of the shutoff valve (42). The

上記逆止弁（４１）は、外周面が小径部と、筒壁に複数の通気孔（４１ｄ）が設けられた中径部、そして大径部とが連続し、その小径部分の一次側となる端部が封じられた円筒状に形成されている。 In the check valve (41), the outer peripheral surface has a small-diameter portion, a medium-diameter portion provided with a plurality of vent holes (41d) in the cylindrical wall, and a large-diameter portion, and the primary side of the small-diameter portion It is formed in a cylindrical shape in which the end portion is sealed.

上記逆止弁（４１）は、その外周面の小径部分と中径部分との段部に”ｏ”リング（４１ｂ）が填め込まれ、また内部にはスプリング（４１ｃ）を組み込んで、上記遮断弁（４２）の内部に、上記逆止弁（４１）の外周面の小径部分が一次側方向となるよう組み込まれている。 The check valve (41) has an “o” ring (41b) inserted in a step portion between a small diameter portion and an intermediate diameter portion of an outer peripheral surface thereof, and a spring (41c) is incorporated inside, thereby blocking the above-described shut-off valve. The small diameter portion of the outer peripheral surface of the check valve (41) is incorporated in the valve (42) so as to be in the primary side direction.

上記スプリング（４１ｃ）は、上記分岐筒部（１２）の第１開口部（１ａ）の底端面に片係して、上記逆止弁（４１）を常に一次側に付勢していて、正常流のガスが流れていないときには、上記遮断弁（４２）の内周小径部と中径部との段部に、上記逆止弁（４１）に取り付けられている”ｏ”リング（４１ｂ）が接合していて、その接合状態が離れて形成される環状の空間の流路（４１ａ）を閉じている。 The spring (41c) is normally engaged with the bottom end surface of the first opening (1a) of the branch cylinder (12) to urge the check valve (41) to the primary side at all times. When the flow gas is not flowing, an "o" ring (41b) attached to the check valve (41) is provided at the step between the inner peripheral small diameter portion and the medium diameter portion of the shutoff valve (42). The flow path (41a) of the annular space that is joined and formed in a separated state is closed.

上記遮断弁（４２）の内部において、正常流が上記スプリング（４１ｃ）の押力に抗して、上記逆止弁（４１）を二次側へ移動させた際に上記流路（４１ａ）が開かれ、その正常流は上記逆止弁（４１）の通気孔（４１ｄ）を通って、該逆止弁（４１）の内部に流れ、上記第２流路（３ａ）に連なる流路が形成される。 Inside the shutoff valve (42), when the normal flow resists the pressing force of the spring (41c) and the check valve (41) is moved to the secondary side, the flow path (41a) The normal flow is opened and flows into the check valve (41) through the vent hole (41d) of the check valve (41) to form a flow path connected to the second flow path (3a). Is done.

上記逆止弁（４１）は、ガスの逆流に伴う逆圧を受けた際、上記スプリング（４１ｃ）の押力に加え、逆流圧によって一次側へ押されて移動し、上記逆止弁（４１）に取り付けられている上記”ｏ”リング（４１ｂ）によって、上記流路（４１ａ）を閉じ、上記第１流路（２ａ）の逆流は防止される。 When the check valve (41) receives a back pressure accompanying a back flow of gas, in addition to the pressing force of the spring (41c), the check valve (41) is pushed and moved to the primary side by the back flow pressure, and the check valve (41) ) Is closed by the “o” ring (41b), and the back flow of the first flow path (2a) is prevented.

さらに、上記逆止弁（４１）に受けた逆圧が、遮断弁（４２）を常に二次側へ付勢してしているスプリング（４２ｅ）の押力より大きいとき、上記遮断弁（４２）は、上記流路（４１ａ）を閉じている上記逆止弁（４１）とともにに一次側へ移動させられ、上記遮断弁（４２）に取り付けられた上記”ｏ”リング（４２ｂ）によって上記流路（４２ａ）を閉じ、第１流路（２ａ）の遮断状態が形成される。 Further, when the back pressure received by the check valve (41) is larger than the pressing force of the spring (42e) always biasing the shut-off valve (42) to the secondary side, the shut-off valve (42 ) Is moved to the primary side together with the check valve (41) closing the flow path (41a), and the flow is caused by the “o” ring (42b) attached to the shutoff valve (42). The path (42a) is closed, and the blocking state of the first flow path (2a) is formed.

上記第１流路（２ａ）の遮断状態を解除可能に拘束する手段は、上記遮断弁（４２）と、上記第１筒体（２）の筒壁に貫通して形成されたロックピン拘束部（４５ａ）を有する溝状のロックピン案内溝（４５）と、上記第１筒体（２）の外周面に回動と往復動可能に填め込まれた遮断解除リング（４３）と、該遮断解除リング（４３）と上記ロックピン案内溝（４５）を貫通して上記遮断弁（４２）の外周部に固着されたロックピン（４４）と、で構成されている。 The means for restraining the shut-off state of the first flow path (2a) so as to be releasable includes the shut-off valve (42) and a lock pin restraining part formed through the cylinder wall of the first cylinder (2). A groove-like lock pin guide groove (45) having (45a), a shut-off release ring (43) fitted in the outer peripheral surface of the first cylindrical body (2) so as to be able to rotate and reciprocate, and the shut-off It comprises a release ring (43) and a lock pin (44) that passes through the lock pin guide groove (45) and is fixed to the outer periphery of the shut-off valve (42).

上記ロックピン案内溝（４５）は、上記第１筒体（２）の筒壁に中心線方向に螺旋状の一部分で形成された溝が、該遮断弁（４２）に固着された上記ロックピン（４４）が常に上記第１筒体（２）の中心線に垂直方向に案内可能に形成されて、さらに上記ロックピン案内溝（４５）の一次側端部の、その溝の一次側の縁に外接し該ロックピン案内溝（４５）の幅より大きい直径の円形状の貫通部を有し、その円形貫通部とロックピン案内溝（４５）の交差段部にロックピン拘束部（４５ａ）が形成されている。 The lock pin guide groove (45) is a lock pin in which a groove formed in a part of a spiral in the center line direction is fixed to the shut-off valve (42) on the cylindrical wall of the first cylindrical body (2). (44) is always formed so as to be able to guide in the direction perpendicular to the center line of the first cylinder (2), and further, the primary side edge of the primary side end of the lock pin guide groove (45) A circular penetrating portion that circumscribes the lock pin guide groove (45) and has a diameter larger than the width of the lock pin guide groove (45), and a lock pin restraining portion (45a) at the intersection of the circular penetrating portion and the lock pin guide groove (45) Is formed.

上記ロックピン（４４）は先端に外ネジを有して丸棒状に形成され、上記遮断解除リング（４３）と上記第１筒体（２）のロックピン案内溝（４５）とを貫通して、上記遮断弁（４２）の外周大径部にその筒壁を貫通しないようにネジ填め合いによって固着されている。 The lock pin (44) is formed in a round bar shape with an external thread at the tip, and penetrates the shut-off release ring (43) and the lock pin guide groove (45) of the first cylinder (2). The shut-off valve (42) is fixed to the outer peripheral large diameter portion by screw fitting so as not to penetrate the cylindrical wall.

上記ロックピン（４４）は、上記遮断弁（４２）が上記流路（４２ａ）を開いている状態において、上記ロックピン案内溝（４５）の二次側端部に位置していて、上記逆止弁（４１）が逆流圧を受け一次側へ移動し、さらに上記遮断弁（４２）が連動して一次側へ移動するときは、上記ロックピン案内溝（４５）に案内されて、上記遮断弁（４２）と上記遮断解除リング（４３）は部分回転しながら一次側へ移動する。 The lock pin (44) is located at the secondary end of the lock pin guide groove (45) in a state where the shutoff valve (42) opens the flow path (42a), and the reverse pin When the stop valve (41) moves to the primary side under backflow pressure, and the shut-off valve (42) moves to the primary side in conjunction with it, the shut-off valve (41) is guided by the lock pin guide groove (45) to The valve (42) and the shut-off release ring (43) move to the primary side while partially rotating.

そして、上記ロックピン（４４）は、上記遮断弁（４２）が上記流路（４２ａ）を閉じる位置において、上記ロックピン案内溝（４５）の一次側端部から上記ロックピン拘束部（４５ａ）の一次側方向の外周部にかけて位置し、上記第１流路（２ａ）をガスが流れていないときは、上記スプリング（４２ｅ）の押力によって、また正常流が流れたときは、上記スプリング（４２ｅ）の押力に加え正常流の圧力によって、上記遮断弁（４２）を二次側に押し戻したとき、該遮断弁（４２）とともに上記ロックピン（４４）も、上記第１筒体（２）内を中心方向に直線的に二次側へ移動させられるが、該ロックピン（４４）は、上記ロックピン拘束部（４５ａ）に掛かり合いし、上記遮断弁（４２）はそれ以上の二次側への移動が不能となり、上記流路（４２ａ）を閉じたまま、第１流路（２ａ）の遮断状態は拘束される。 The lock pin (44) extends from the primary side end of the lock pin guide groove (45) at a position where the shutoff valve (42) closes the flow path (42a). When the gas is not flowing through the first flow path (2a), the spring (42e) is pressed, and when a normal flow is flowing, the spring ( When the shut-off valve (42) is pushed back to the secondary side by the normal flow pressure in addition to the pushing force of 42e), the lock pin (44) and the shut-off valve (42) are also connected to the first cylindrical body (2 The lock pin (44) is engaged with the lock pin restraining portion (45a), and the shut-off valve (42) is further moved to the secondary side. The movement to the next side becomes impossible and Remains closed flow path (42a), cut-off state of the first flow path (2a) is restrained.

上記拘束されている遮断状態からの復帰手段は、上記ロックピン（４４）が固着されている上記遮断解除リング（４３）によって、上記ロックピン（４４）を上記ロックピン案内溝（４５）に沿うように、上記ロックピン拘束部（４５ａ）からはずす回転操作をすることによって拘束状態を解除し、その後、上記スプリング（４２ｅ）によって上記遮断弁（４２）は、二次側へ押されて移動して流路（４２ａ）は開かれ、上記第１流路（２ａ）の遮断状態の拘束は解除される。 The means for returning from the constrained shut-off state is such that the lock pin (44) is moved along the lock pin guide groove (45) by the shut-off release ring (43) to which the lock pin (44) is fixed. As described above, the rotation is released from the lock pin restraining portion (45a) to release the restrained state, and then the shut-off valve (42) is pushed and moved to the secondary side by the spring (42e). Then, the flow path (42a) is opened, and the restriction of the blocking state of the first flow path (2a) is released.

次ぎに、上記第２流路（３ａ）に設けられて、逆火炎をガス化する手段と逆火炎の熱によって正常流を遮断し、その遮断状態を認知可能な手段の詳細について図５ないし図６に示して説明する。 Next, details of means provided in the second flow path (3a) for gasifying the reverse flame and means for interrupting the normal flow by the heat of the reverse flame and recognizing the interruption state are shown in FIGS. This will be described with reference to FIG.

上記逆火炎をガス化する手段は、前述の上記円筒部（１１）の第２開口部（１ｂ）に第２筒体（３）が連結されて形成される筒部（５２）に、ガスは通過するが逆火炎をガス化する円筒状の消炎フィルター（５１）と、片側が上記消炎フィルター（５１）を内側から支持可能に、他方の片側が上記筒部（５２）に組み込まれて流路（５３ａ）を形成可能な円筒状の受座（５３）と、を具備して構成されている。 The means for gasifying the reverse flame is such that the gas is supplied to the cylindrical portion (52) formed by connecting the second cylindrical body (3) to the second opening (1b) of the cylindrical portion (11). Cylindrical extinguishing filter (51) that passes but gasifies back flame, and one side is capable of supporting the extinguishing filter (51) from the inside, and the other one side is incorporated into the cylindrical part (52) and is a flow path And a cylindrical seat (53) capable of forming (53a).

逆火炎の熱によって正常流を遮断する手段は、上記円筒部（１１）の第３開口部（１ｃ）側の端部の外周面にネジ填め合いされる遮断弁棒キャップ（６２）と、中間に位置して第１”ｏ”リング（６１ａ）が取り付けられ、片側が上記遮断弁棒キャップ（６２）に往復動可能な外周面に連続して、第２”ｏ”リング（６１ｂ）が取り付けられて上記第３開口部（１ｃ）の内周面に気密状に往復動可能な外周面を有し、他方の片側が第３”ｏ”リング（６１ｃ）が取り付けられて上記受座（５３）との内周部に気密状に往復動可能な丸棒状の遮断弁棒（６１）と、上記遮断弁棒キャップ（６２）に片係して常に上記遮断弁棒（６１）を二次側に付勢するスプリング（６１ｄ）と、上記受座（５３）の内周端部に上記流路（５３ａ）に臨むように組み込まれ、常温では固体状であって、熱せられると溶解する溶解金属（６３）と、を具備して構成されている。 Means for shutting off the normal flow by the heat of the reverse flame includes a shutoff valve stem cap (62) screwed to the outer peripheral surface of the end portion on the third opening (1c) side of the cylindrical portion (11), and an intermediate The first “o” ring (61a) is attached at one side, and the second “o” ring (61b) is attached to one side of the outer peripheral surface that can reciprocate with the shut-off valve stem cap (62). The third opening (1c) has an outer peripheral surface that can reciprocate in an airtight manner, and a third "o" ring (61c) is attached to the other side to attach the seat (53 ) And a round bar-shaped shut-off valve rod (61) capable of reciprocating in an airtight manner, and the shut-off valve rod (61) is always engaged with the shut-off valve rod cap (62). A spring (61d) that urges against the inner surface and an inner peripheral end of the seat (53) so as to face the flow path (53a) Is incorporated viewed at normal temperature a solid shape and is configured by including a molten metal (63) which dissolves when heated, the.

上記消炎フィルター（５１）は、可燃性ガスの種類、使用する圧力と流量に応じて求められる通気性を保持するように選択された粒子状金属を、円筒状に焼結して成形されたものを用いている。 The above-mentioned flame extinguishing filter (51) is formed by sintering a particulate metal selected so as to maintain the air permeability required according to the type of combustible gas, the pressure and flow rate used, into a cylindrical shape. Is used.

上記消炎フィルター（５１）の外径は、上記第２筒体（３）の大径部の内径より小さく、該第２筒体（３）に組み込まれて、上記消炎フィルター（５１）の外周面と上記第２筒体（３）との大径部の内周面に環状の空間ができるによう形成されている。 The outer diameter of the flame-extinguishing filter (51) is smaller than the inner diameter of the large-diameter portion of the second cylindrical body (3), and is incorporated in the second cylindrical body (3). And the second cylinder (3) are formed so that an annular space is formed on the inner peripheral surface of the large diameter portion.

上記第２受座（５３）は、円筒状に形成されていて、外周面が一次側端部に上記消炎フィルター（５１）の内周面の片側を案内可能な中径部、その中径部より小さくてその筒壁に複数の通し穴（５３ｄ）を有する小径部、その小径部よりさらに小さい径の外周部、上記消炎フィルター（５１）を内周面の他方の片側から案内支持する中径部、上記消炎フィルター（５１）の外径と同じ直径の大径部を有するフランジ部（５３ｂ）と、そのフランジ部（５３ｂ）に連接して、該フランジ部（５３ｂ）とともに流路（５３ａ）を形成可能に第２筒体（３）の中径部に填め合いされる軸部（５３ｃ）とが連続して形成されている。 The second seat (53) is formed in a cylindrical shape, and an outer peripheral surface thereof is capable of guiding one side of the inner peripheral surface of the flame-extinguishing filter (51) to the primary side end portion, and the intermediate diameter portion thereof A smaller diameter portion having a plurality of through holes (53d) in the cylindrical wall, an outer peripheral portion having a diameter smaller than that of the smaller diameter portion, and a medium diameter for guiding and supporting the flame extinguishing filter (51) from the other side of the inner peripheral surface. A flange portion (53b) having a large-diameter portion having the same diameter as the outer diameter of the flame extinguishing filter (51), and a flow path (53a) connected to the flange portion (53b) together with the flange portion (53b) Is formed continuously with the shaft portion (53c) fitted into the middle diameter portion of the second cylindrical body (3).

上記流路（５３ａ）を形成する上記フランジ部（５３ｂ）と上記軸部（５３ｃ）は、フランジ部（５３ｂ）の二次側の端面に中心方向に垂直となる帯状の溝ができるように、上記軸部（５３ｃ）の端部から、該受座（５３）の内周部の直径より大きい厚さとなる板状の切り込みが形成されている。 The flange portion (53b) and the shaft portion (53c) forming the flow path (53a) are formed in a belt-like groove perpendicular to the center direction on the secondary side end face of the flange portion (53b). A plate-like cut having a thickness larger than the diameter of the inner peripheral portion of the seat (53) is formed from the end of the shaft portion (53c).

上記受座（５３）は、その一次側端面が後述の遮断弁棒（６１）に取り付けられた第１”ｏ”リング（６１ａ）が気密状に接合可能に、そして内周面が、該遮断弁棒（６１）の小径部の外周より大きい大径部と、後述の遮断弁棒（６１）に第３”ｏ”リング（６１ｃ）が取りつけられて気密状に往復動可能な小径部と、が連続して形成されている。 The seat (53) has a primary end face that can be joined airtightly to a first "o" ring (61a) attached to a shut-off valve rod (61) described later, and an inner peripheral face of the shut-off valve (61). A large-diameter portion larger than the outer periphery of the small-diameter portion of the valve stem (61), and a small-diameter portion capable of reciprocating in a gas-tight manner by attaching a third “o” ring (61c) to the shut-off valve rod (61) described later. Are formed continuously.

さらに、上記受座（５３）は、上記フランジ部（５３ｂ）の端面に形成された帯状の溝とが交差する内周端部に、後述の溶解金属（６３）を填め込んで取り付けられる溶解金属キャップ（６４）用の内ネジが形成されている。 Further, the seat (53) is a molten metal that is attached by inserting a molten metal (63), which will be described later, into an inner peripheral end portion intersecting with a belt-like groove formed on the end face of the flange portion (53b). An internal thread for the cap (64) is formed.

上記消炎フィルター（５１）は、その両端の内周面が上記受座（５３）の外周面の２カ所の中径部分に案内支持されて、該消炎フィルター（５１）の片側端面が上記受座（５３）のフランジ部（５３ｂ）の一次側端面に第１パッキン（５４ａ）を介し、他方の端面が上記三方筒体（１）の第２開口部（１ｂ）の底端面に取り付けられた第２パッキン（５４ｂ）を介して、該第２開口部（１ｂ）に上記第２筒体（３）を連結して形成される筒部（５２）に、上記受座（５３）の軸部（５３ｃ）が該第２筒体（３）の内周中径部に支持されて組み込まれている。 The flame extinguishing filter (51) has its inner peripheral surfaces guided and supported by two inner diameter portions of the outer peripheral surface of the seat (53), and one end surface of the flame extinguishing filter (51) is supported by the seat. A first end (54a) is attached to the primary side end face of the flange part (53b) of (53), and the other end face is attached to the bottom end face of the second opening (1b) of the three-way cylinder (1). The cylindrical portion (52) formed by connecting the second cylindrical body (3) to the second opening (1b) via the two packings (54b) is connected to the shaft portion (53) of the seat (53). 53c) is supported and incorporated in the inner peripheral inner diameter portion of the second cylinder (3).

上記遮断弁棒（６１）は、その外周面が上記第３開口部（１ｃ）の外周部にネジ填め合いされて取り付けられた遮断弁棒キャップ（６４）の底端面の中央穴を往復動可能な中径部と、第２”ｏ”リング（６１ｂ）が取り付けられて上記第三開口部（１ｃ）の内周面に気密状に往復動可能な大径部と、第３”ｏ”リング（６１ｃ）が填め込まれて上記受座（５３）の内周小径部に気密状に往復動可能な小径部を連続して有し、そして大径部と小径部との段部に上記第１”ｏ”リング（６１ａ）填め込まれて、上記受座（５３）の一次側端面に接合して、該受座（５３）の内部を気密状に封じることが可能に形成されている。 The shut-off valve stem (61) is capable of reciprocating through the central hole in the bottom end face of the shut-off valve stem cap (64) attached with the outer peripheral surface screwed into the outer peripheral portion of the third opening (1c). A medium-diameter portion, a large-diameter portion to which a second “o” ring (61b) is attached and capable of reciprocating in an airtight manner on the inner peripheral surface of the third opening (1c), and a third “o” ring (61c) is inserted into the inner peripheral small diameter portion of the seat (53) continuously having a small diameter portion capable of reciprocating in an airtight manner, and the step portion between the large diameter portion and the small diameter portion has the first A 1 "o" ring (61a) is fitted and joined to the primary side end face of the seat (53) so that the interior of the seat (53) can be sealed in an airtight manner.

上記第２”ｏ”リング（６１ｂ）と第３”ｏ”リング（６１ｃ）は、使用する可燃性ガスの種類とその圧力と流量に応じて、爆発を伴う逆火炎が発生した際の気密性を向上させるために、それぞれ多重に取り付けられてもよく、図は逆火炎に伴う逆圧が高くなる場合を想定し、より気密性を保持するため二重化された場合を示す。 The second "o" ring (61b) and the third "o" ring (61c) are airtight when a reverse flame accompanied by an explosion occurs depending on the type of combustible gas used, its pressure and flow rate. In order to improve the above, each of them may be attached in a multiple manner, and the figure shows a case where a double pressure is maintained in order to maintain more airtightness, assuming that the back pressure associated with the back flame becomes high.

溶解金属キャップ（６４）は、片側が封じられた円筒状に形成されて、その円筒状の筒壁に複数の通気孔（６４ｂ）と、片側が封じられたその端面に形成された通気孔（６４ａ）とが設けられ、開口部側の外周端部には外ネジが形成されている。 The molten metal cap (64) is formed in a cylindrical shape sealed on one side, and has a plurality of ventilation holes (64b) in the cylindrical tube wall, and a ventilation hole (on the end face sealed on one side) ( 64a), and an external thread is formed at the outer peripheral end on the opening side.

溶解金属（６３）は、固体状態において丸棒状となるよう形成され、上記溶解金属キャップ（６４）に圧入して填め込まれて、上記溶解金属キャップ（６４）の開口側が一次側を向いて、上記第２受座（５３）の内周面と該受座（５３）の上記フランジ部（５３ｂ）の端面の溝とが交差する部分形成された内ネジに、上記溶解金属キャップ（６４）の通気孔（６４ａ，６４ｂ）を通じて、上記流路（５３ａ）を臨むようにネジ填め合いされて組み込まれている。 The molten metal (63) is formed into a round bar shape in the solid state, and is press-fitted into the molten metal cap (64), and the opening side of the molten metal cap (64) faces the primary side, The molten metal cap (64) is formed on the inner screw formed at a portion where the inner peripheral surface of the second seat (53) and the groove on the end surface of the flange portion (53b) of the seat (53) intersect. Screwed together so as to face the flow path (53a) through the ventilation holes (64a, 64b) and incorporated.

スプリング（６１ｄ）は、上記第３開口部（１ｃ）に取り付けられた上記遮断弁棒キャップ（６２）の内周段部に片係し、上記遮断弁棒（６１）の中径部に填め込まれ、該遮断弁棒（６１）を常に二次側に付勢している。 The spring (61d) is partly engaged with the inner peripheral step of the shut-off valve stem cap (62) attached to the third opening (1c), and is fitted into the middle diameter portion of the shut-off valve stem (61). Rarely, the shut-off valve rod (61) is always biased to the secondary side.

上記遮断弁棒（６１）は、上記スプリング（６１ｄ）によって常に二次側に付勢されていて、該遮断弁棒（６１）の小径部の端部が、上記第２受座（５３）に取り付けられた上記溶解金属キャップ（６４）内の固体状の上記溶解金属（６３）の端面に突き当たった位置において、上記受座（５３）の一次側端面と内周面との環状の角部分と、該遮断弁棒（６１）に取りつけられた第１”ｏ”リング（６１ａ）の外側との環状の空間に流路（５２ａ）が形成される。 The shut-off valve rod (61) is always urged to the secondary side by the spring (61d), and the end of the small diameter portion of the shut-off valve rod (61) is in the second seat (53). An annular corner portion between the primary side end surface and the inner peripheral surface of the seat (53) at a position where it abuts against the end surface of the solid molten metal (63) in the molten metal cap (64) attached. A flow path (52a) is formed in an annular space with the outside of the first "o" ring (61a) attached to the shut-off valve rod (61).

第２流路（３ａ）の正常流は、上記第１流路（２ａ）をから連続して上記流路（５２ａ）を通って上記受座（５３）の内部に入り、上記受座（５３）の通し穴（５３ｄ）を通って上記消炎フィルター（５１）の内部に入る。さらに、該消炎フィルター（５１）の筒壁を通過して、上記第２筒体（３）の内周面との上記第２パッキン（５４ｂ）、上記消炎フィルター（５１）、上記第１パッキン（５４ａ）、そして上記受座（５３）のフランジ部（５３ｂ）の外周面の環状の空間を通って、該フランジ部（５３ｂ）と軸部（５３ｃ）とが上記筒部（５２）に組み込まれて形成された上記流路（５３ａ）を通ってガス放出側の接続機器（図示略）へ流れる。 The normal flow of the second flow path (3a) continues from the first flow path (2a) through the flow path (52a) and enters the interior of the seat (53). ) Through the through hole (53d) and into the anti-flame filter (51). Further, the second packing (54b) with the inner peripheral surface of the second cylindrical body (3), the second flame extinguishing filter (51), the first packing ( 54a), and through the annular space on the outer peripheral surface of the flange portion (53b) of the seat (53), the flange portion (53b) and the shaft portion (53c) are assembled into the cylindrical portion (52). It flows to the connecting device (not shown) on the gas discharge side through the flow path (53a) formed in this way.

上記第２流路（３ａ）を逆流するガスや逆火炎は、該第２流路（３ａ）を逆方向に流れるが、上記消炎フィルター（５１）の外周面からその筒壁を通過する際、逆火炎の火炎は消滅してガス化される。また上記溶解金属（６３）が、上記流路（５３ａ）を通過する逆火炎に触れたり、他の条件で上記流路（５３ａ）が高温となるような状態になって溶解した際、常に二次側に付勢されている上記スプリング（６１ｄ）によって、上記溶解状態の溶解金属（６３）を上記溶解金属キャップ（６４）の通気孔（６４ａ，６４ｂ）から押し出しながら移動し、上記遮断弁棒（６１）に取り付けられた上記”ｏ”リング（６１ａ）によって上記流路（５２ａ）は閉じられ、第２流路（３ａ）の正常流は遮断される。 The gas or back flame that flows backward through the second flow path (3a) flows in the reverse direction through the second flow path (3a), but when passing through the cylindrical wall from the outer peripheral surface of the flame extinguishing filter (51), The reverse flame flame disappears and is gasified. In addition, when the molten metal (63) touches the back flame passing through the flow path (53a) or melts in a state where the flow path (53a) becomes hot under other conditions, the molten metal (63) The molten metal (63) in the molten state is pushed out from the vent holes (64a, 64b) of the molten metal cap (64) by the spring (61d) biased to the next side, and the shut-off valve rod The flow path (52a) is closed by the “o” ring (61a) attached to (61), and the normal flow of the second flow path (3a) is blocked.

上記第２流路（３ａ）の遮断状態を認知可能な手段は、図５ないし図６に示すように、上記遮断弁棒（６１）が上記流路（５２ａ）を開いている正常状態の位置において、該遮断弁棒（６１）の先端部は、上記遮断弁棒キャップ（６２）の外側端面より埋没しない長さに形成され、
上記遮断弁棒（６１）が上記流路（５２ａ）を閉じて遮断状態にあるとき、上記遮断弁棒キャップ（６２）の外側端面からの上記遮断弁棒（６１）の端部の位置が、正常状態に位置するときとの違いによって認知可能となる。As shown in FIGS. 5 to 6, the means capable of recognizing the shut-off state of the second flow path (3a) is a normal position where the shut-off valve rod (61) opens the flow path (52a). The tip of the shut-off valve stem (61) is formed to a length that is not buried from the outer end face of the shut-off valve stem cap (62),
When the shut-off valve stem (61) closes the flow path (52a) and is in a shut-off state, the position of the end of the shut-off valve stem (61) from the outer end surface of the shut-off valve stem cap (62) is It becomes recognizable by the difference from when it is in a normal state.

さらに、上記遮断弁棒キャップ（６２）は、その底端部の穴の内周面に上記遮断弁棒（６１）の端部を案内可能にマーカー（６１ｅ）が取り付けられていて、該遮断弁棒（６１）が上記流路（５２ａ）を開いているとき、該遮断弁棒（６１）の遮断弁棒キャップ（６２）に案内される先端部が、上記遮断弁棒キャップ（６２）の外側端面より埋没せず、上記マーカー（６１ｅ）は外側から見えず、上記遮断弁棒（６１）が上記流路（５２ａ）を閉じるよう移動した際に、上記遮断弁棒キャップ（６２）に取り付けられたマーカー（６１ｅ）が露出して、外側から上記流路（５２ａ）の閉じられた状態をマーカ（６１ｅ）によって、より積極的に知らせることが可能となっている。 Further, the shut-off valve stem cap (62) has a marker (61e) attached to the inner peripheral surface of the hole at the bottom end thereof so that the end of the shut-off valve stem (61) can be guided. When the rod (61) opens the flow path (52a), the tip of the shut-off valve rod (61) guided by the shut-off valve rod cap (62) is located outside the shut-off valve rod cap (62). The marker (61e) is not visible from the outside without being buried from the end face, and is attached to the shut-off valve stem cap (62) when the shut-off valve stem (61) moves to close the flow path (52a). The marker (61e) is exposed, and the closed state of the channel (52a) can be more positively notified from the outside by the marker (61e).

上記マーカー（６１ｅ）は、塗装または色付きのリングを填め込んでもよい。 The marker (61e) may be filled with a painted or colored ring.

また、上記遮断弁棒（６１）は、上記遮断弁棒キャップ（６２）に案内される端部の外周面に、流路内の高圧状態を知らせるマーカー（６１ｆ）が取り付けられていて、上記遮断弁棒キャップ（６２）に片係して、上記遮断弁棒（６１）を常に二次側に付勢しているスプリング（６１ｄ）の押力よりも流路内の内圧が大きくなった際、上記遮断弁棒（６１）は、その先端部が遮断弁棒キャップ（６２）から外側へ押し出されるように移動し、マーカー（６１ｆ）は露出する。 The shut-off valve stem (61) is provided with a marker (61f) for notifying the high pressure state in the flow path on the outer peripheral surface of the end portion guided by the shut-off valve stem cap (62). When the internal pressure in the flow path becomes larger than the pressing force of the spring (61d) that constantly biases the shut-off valve rod (61) to the secondary side in unison with the valve stem cap (62), The shut-off valve stem (61) moves so that its tip is pushed outward from the shut-off valve stem cap (62), and the marker (61f) is exposed.

上記スプリング（６１ｄ）は、上記遮断弁棒（６１）を常に二次側に付勢する強さが、上記消炎フィルター（５１）の最大の消炎能力に対応する可燃性ガスの内圧に対向する強さに設定されていて、上記第２流路（３ａ）の二次側を密封状態にしたとき、その内圧によって上記遮断弁棒（６１）のその先端部が遮断弁棒キャップ（６２）から外側へ露出した場合は、使用する可燃性ガスの圧力が高い危険な状態を示す。 The spring (61d) has a strength that always biases the shut-off valve rod (61) to the secondary side, and is a strong force that opposes the internal pressure of the combustible gas corresponding to the maximum flame extinguishing ability of the flame extinguishing filter (51). When the secondary side of the second flow path (3a) is sealed, the tip of the shut-off valve rod (61) is moved outward from the shut-off valve stem cap (62) by the internal pressure. If it is exposed to, it indicates a dangerous state where the pressure of the combustible gas used is high.

上記マーカー（６１ｆ）は、塗装または色付きのリングを填め込んでもよい。 The marker (61f) may be filled with a painted or colored ring.

また、上記三方筒体（１）は、図２に示すようにＬ字上の配管経路にも設置できるよう、上記円筒部（１１）に上記分岐筒部（１２）が直角方向に延びるように形成されていてもよい。上記三方筒体（１）の形状を変えても、他の構成部品を変更することなく本発明の可燃性ガス流路の乾式安全器は実現できる。 In addition, the three-way cylinder (1) is arranged so that the branch cylinder part (12) extends in a perpendicular direction to the cylindrical part (11) so that it can be installed in an L-shaped piping route as shown in FIG. It may be formed. Even if the shape of the three-way cylinder (1) is changed, the combustible gas flow path dry safety device of the present invention can be realized without changing other components.

なお、上記可燃性ガス供給側の配管接続機器（図示略）ならびガス放出側の接続機器（図示略）との配管接続の手段は、本発明の実施例によって限定するものではない。 Note that the means for pipe connection with the combustible gas supply side pipe connection device (not shown) and the gas discharge side connection device (not shown) is not limited by the embodiments of the present invention.

本発明の実施形態の縦断面図である。 It is a longitudinal cross-sectional view of embodiment of this invention. 本発明の実施形態の縦断面図である。 It is a longitudinal cross-sectional view of embodiment of this invention. 本発明の実施形態の縦断面図である。 It is a longitudinal cross-sectional view of embodiment of this invention. 本発明の実施形態の要部斜視図である。 It is a principal part perspective view of embodiment of this invention. 本発明の実施形態の縦断面図である。 It is a longitudinal cross-sectional view of embodiment of this invention. 本発明の実施形態の要部斜視図である。 It is a principal part perspective view of embodiment of this invention.

Explanation of symbols

１三方筒体１１円筒部１２分岐筒部
１ａ第１開口部１ｂ第２開口部１ｃ第３開口部
２第１筒体２ａ第１流路２ｂ “ｏ”リング
２１袋ナット２２１“ｃ”ピン
３第２筒体３ａ第２流路３ｂ “ｏ”リング３ｃ配管接続部
４１逆止弁４１ａ流路
４２遮断弁４２ａ流路
５１消炎フィルター
５２筒部５２ａ流路
５３受座５３ａ流路５３ｂフランジ部５３ｃ軸部５３ｄ通し穴
５４ａ第１パッキン５４ｂ第２パッキン
６１遮断弁棒６１ａ第１“ｏ”リング６１ｂ第２“ｏ”リング
６１ｃ第３“ｏ”リング６１ｄスプリング６１ｅマーカー６１ｆマーカー
６２遮断弁棒キャップ６３溶解金属６４溶解金属キャップDESCRIPTION OF SYMBOLS 1 Three-way cylinder 11 Cylindrical part 12 Branch cylinder part 1a 1st opening part 1b 2nd opening part 1c 3rd opening part 2 1st cylinder 2a 1st flow path 2b "o" ring 21 Cap nut 22 1 "c" pin 3 Second cylinder 3a Second flow path 3b “o” ring 3c Pipe connection part 41 Check valve 41a Flow path 42 Shut-off valve 42a Flow path 51 Flame extinguishing filter 52 Tube part 52a Flow path 53 Seat 53a Flow path 53b Flange part 53c Shaft 53d Through-hole 54a First packing 54b Second packing 61 Shut-off valve rod 61a First "o" ring 61b Second "o" ring 61c Third "o" ring 61d Spring 61e Marker 61f Marker 62 Shut-off valve rod cap 63 Dissolved metal 64 Dissolved metal cap

Claims

A cylindrical portion (11) having a second opening (1b) at the end and a third opening (1c) at the other end, and a first opening at the end extending across the cylindrical portion (11) A branch cylinder part (12) having a part (1a), and a three-way cylinder (1) formed with a continuous space inside,
A check valve (41) for preventing backflow in the first flow path (2a) formed by connecting the first cylinder (2) to the first opening (1a) of the branch cylinder (12); A shutoff valve (42) for shutting off the flow path in conjunction with the check valve (41), preventing the backflow, shutting off the flow path, and releasably restricting the shutoff state;
It has a cylinder part (52) formed by connecting the second cylinder (3) to the second opening (1b) of the cylinder part (11) and communicates with the first flow path (2a). A second flow path (3a) is formed, and a cylindrical flame extinguishing filter (51) that gasifies the reverse flame while gas passes through the second flow path (3a), and the flame extinguishing filter (51) on one side. A cylindrical seat (53) having a flange portion (53b) capable of forming a flow path (53a) by being incorporated in the cylindrical portion (52) so that the other side is supported from the inside. Means for gasifying the reverse flame,
A shutoff valve rod cap (62) attached to the end of the cylindrical portion (11) on the third opening (1c) side, and a first “o” ring (61a) located in the middle are attached to one side. The second "o" ring (61b) is attached continuously to the outer peripheral surface capable of reciprocating with the shut-off valve stem cap (62) so that the inner peripheral surface of the third opening (1c) is airtight. A round bar-shaped shut-off valve having an outer peripheral surface capable of reciprocating movement and having a third “o” ring (61c) attached to the other side and capable of reciprocating in an airtight manner on the inner peripheral surface of the seat (53). A rod (61), a spring (61d) that always urges the shut-off valve rod (61) to the secondary side in a single engagement with the shut-off valve stem cap (62), and a second flow path (3a). It has a means to be incorporated so as to face, and is a molten metal that is solid at normal temperature and dissolves when heated (63 When blocks the flow passage when the molten metal (63) is dissolved by reverse flame heat anda perceptible means the cut-off state, is provided,
The normal flow gas flows from the primary side of the first flow path (2a) to the secondary side of the second flow path (3a),
The flame extinguishing filter (51) has one end face on the end face of the flange (53b) of the seat (53) via the first packing (54a) and the other end face on the second opening of the cylindrical portion (11). Incorporated into the cylindrical part (52) via the second packing (54b) attached to the bottom end surface of the part (1b),
The secondary valve end of the cutoff valve rod (61), which is constantly biased to the secondary side by the spring (61d), is connected to the second flow path (3a). The first flow path is formed in a space outside the first “o” ring (61a) attached to the shut-off valve rod (61) at a position where it hits the incorporated solid molten metal (63). A channel (52a) communicating with the channel (2a) and having a means communicating with the inside of the flame extinguishing filter (51) is formed;
The normal flow gas in the second flow path (3a) passes through the flow path (52a) from the first flow path (2a) and enters the inside of the flame filter (51). 51) passes through the cylindrical wall of the flame-extinguishing filter (51), and the flange portion of the second packing (54b), the flame-extinguishing filter (51), the first packing (54a) and the seat (53). The above-mentioned flow formed by the flange portion (53b) being incorporated into the cylindrical portion (52) from the annular space between the respective outer peripheral surfaces of (53b) and the inner peripheral surface of the cylindrical portion (52). Flowing through the path (53a) to the secondary side of the second flow path (3a),
The back flame that flows back through the second flow path (3a) is gasified when passing through the cylindrical wall from the outer peripheral surface of the extinguishing filter (51), and the molten metal (63) touches the back flame. When dissolved, the shut-off valve stem (61) is pushed by the spring (61d) that is unilaterally engaged with the shut-off valve stem cap (62) and moves in the secondary direction, and the shut-off valve stem ( 61) The first “o” ring (61a) attached to 61) closes the flow path (52a) and shuts off the second flow path (3a),
The means capable of recognizing the shut-off state of the second flow path (3a) is such that the shut-off valve rod (61) is in a normal state where the flow path (52a) is open, and the shut-off valve stick cap (62). The front end of the shut-off valve rod (61) on the side guided by the valve has a shape that is not buried from the outer end surface of the shut-off valve rod cap (62), and the shut-off valve rod (61) is in the flow path. When the shut-off state is closed with (52a) closed, the position of the end of the shut-off valve stem (61) from the outer end face of the shut-off valve stem cap (62) differs depending on the difference from the normal position. A dry safety device with a combustible gas flow path, characterized by being able to recognize the state.

The three-way cylinder (1) includes a cylindrical portion (11) having a second opening (1b) at the end and a third opening (1c) at the other end, and a direction perpendicular to the cylindrical portion (11). 2. The combustible gas flow path according to claim 1, wherein the end of the combustible gas channel has a space that is continuous with the branch cylinder portion (12) having the first opening (1 a) at an end portion that extends in an intersecting manner. Dry type safety device.

The shut-off valve stem cap (62) has a marker (61e) attached to the inner peripheral surface so that the tip of the shut-off valve stem (61) can be guided, and the shut-off valve stem (61) is connected to the flow path (61). 52a) is open, the tip of the shut-off valve stem (61) is not buried from the end face of the shut-off valve stem cap (62), conceals the marker (61e), and the shut-off valve stem (61) 2. The combustible gas flow path dry safety device according to claim 1, wherein the marker (61 e) is exposed when the flow path (52 a) is closed. 3.

A marker (61f) is attached to the outer peripheral surface of the end portion guided by the shut-off valve stem cap (62) at a position where the shut-off valve stem (61) is not exposed from the shut-off valve stem cap (62) in a normal state. When the pressure of the normal flow gas becomes higher than the pressing force of the spring (61d) always urging the shut-off valve rod (61) to the secondary side, the internal pressure causes the shut-off valve The combustible gas flow path according to claim 1 and 3, wherein a tip end of the rod (61) is pushed out of the shut-off valve rod cap (62), and the marker (61f) is exposed. Dry type safety device.

The seat (53) has an outer peripheral surface that can guide the inner peripheral surface of the flame-extinguishing filter (51) from the primary side end, and the flame-extinguishing filter (51). ) And an outer peripheral portion capable of forming an annular space, an outer peripheral portion capable of guiding the inner peripheral surface of the flame-extinguishing filter (51), and the flame-extinguishing filter (51) capable of being engaged with each other. 51) and a flange portion (53b) having the same outer diameter as that of the outer diameter of 51) are formed in series, and further connected to the flange portion (53b), together with the flange portion (53b), to the cylindrical portion (52). A shaft portion (53c) that is incorporated to form the flow path (53a);
The inner peripheral surface of the seat (53) has a first "o" ring (61a) whose primary side end face is fitted in the shut-off valve rod (61) so that the shut-off valve rod (61) can be guided. A large-diameter portion that can be joined and a small-diameter portion that allows the third “o” ring (61c) attached to the shut-off valve rod (61) to reciprocate in an airtight manner are formed continuously. The cylindrical wall of the outer peripheral surface, which is located at the inner peripheral large diameter portion of the seat (53) and can form an annular space with the inner peripheral surface of the flame-extinguishing filter (51), from the inside of the seat (53) The dry safety device for a combustible gas passage according to claim 1, further comprising a through hole (53d) communicating with the inside of the flame extinguishing filter (51).